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1、二年级数学口算405 =81+1+6=93=45+2219=56 =74 =59+25=5139=97 =24 =34+33=497=67 =72 =7252=86 =53+11=153=40+29=64 =8539=56+26=75 =42 =8330=44=205=36+53=29+28=213 =7748=11+17=68 =73 =62+15=5413=26 =48 =46+14=62=35 =48 =18+20=66 =7665=841=53+29=155=7159=6860=25 =204=86+4+6=164=85 =66 =53+17=39+16=95 =65+12=48865
2、 =75 =52+39=18 =29 =27+53=25 =15+19=85 =126=5626=75 =142=8756=87 =66=75 =72 =772553+46=52+17=2425 =205=408 =38+56=5718=24 =69 =49+16=33+53=46+3=34 =8249731 =7556=43 =9166=65 =52732+4765 =44 =76 =69 =432242738+25+101536359=3522797577 =61 =28443+2093 =93=63 =86 =8536=6425=11 =488361114 =86 =36+56=33 =
3、65 =78570+277631 =355=46 =73 =55+29=54+28=328 =26 =26+3060+32122 =29+67=164=246261571 =53 =24 =49782 =36 =66-36=6349788412713=22+（12+14）47 =73 =84+3=6860=44 =75 =6639=44+29=16+13=4+6=63 =366 =7259=255=67 =62+15=5413=68 =7555=7143=50+17=23 =43 =64+21=123=52 =9713=27+52=85 =78 =9282=126=86 =56 =9487=6
4、2=209=52+24+6=10+53+7=76384462162217153736692058285752541382456254689471535147272245396330814140564023181249559244383155243772131465929815814887963607348482331472162269406532453243229735149754168752293114243296320367153226142432666143289926201499408561671182939602424734572206034246161418437560691516
5、313143971812691184717217826410284530452132461326129583164978134305466181624595028345725553873067874164861547123256853515915643719442273844824462543648763044179671147571516401877313585275591947571877901230516534635594016864778664224221914766559552934161543536674927419460567336125997584266615357551625
6、384716853872497234653404102284571876245093739134734418131245315414916022668285761858288620611747877693158863468051791618342045388331924624176326100271537885112247258731385049345725544653335757139437529381171135325357559291896955716388573324343136285319322466272693711756243746742712666421553328932559
7、1211601414771614128987652121398213981133287242270379940181374678561712666117113532557559999965532+4765 =44 =76 =69 =4323=43 =64+21=15+47=52 =9713=27+52=85 =78 =9282=64+14=86 =56=502814778735387575412674711686154712=2315=3713=6425=7313=2719=4517=3516=7425=1946=8529=2338=5723=10080=6314=4726=3238=2448=3828=9977=48=324=306=78=567=183=91=53=486=37=427=39=122=244=255=328=186=217=648=490=32=82=45=122=33=56=84=24=5+50=16+40=73=243=63=43=567=35=506=7051=42=4846=10 / 10